AQL (Acceptable Quality Limit) is the worst tolerable defect rate in a production batch—the maximum percentage of defective units that can be accepted while still passing inspection. It turns subjective “good enough” into a numbered, auditable standard.

Most sportswear brands apply ANSI/ASQ Z1.4 (equivalent to ISO 2859-1) sampling:

• General Inspection Level II for lot sizing;
• AQL 2.5 for major defects (broken seams, misaligned logos);
• AQL 4.0 for minor defects (loose threads, cosmetic marks).

Without a defined AQL, factories self-grade and defective activewear reaches customers—driving returns and eroding brand trust.